CSS Guide
Plain-language answers about Google Comparison Shopping Services: what a CSS is, what it costs, how to switch and what changes in your account.
About Bigconvert CSS: who we are, our CSS domains and our history in the Google programme
Bigconvert operates three Google-approved Comparison Shopping Services (Bigconvert.com, Bigconvert, ProductXL.com) with over 2,000 active stores and 3.5 million clicks a month. The company, the founders, the Premium status history (2019, 2023), the current status, contact details and verifiable figures.
Bigconvert CSS vs Producthero vs csspartner.io: an honest comparison
The three flat-fee CSSs stores most often compare, side by side on price, free trial, support, countries, tools and status. The cost saving is the same at all three; the differences are elsewhere.
"By Bigconvert.com" under Google Shopping ads: what the label means
The label "By Bigconvert.com", "By Bigconvert" or "By ProductXL.com" under a Google Shopping ad shows which Comparison Shopping Service (CSS) placed the ad. What it means for shoppers, for the store, and why it appears instead of "By Google".
CSS for agencies: how to put all your clients' accounts on a partner CSS
What a Google Ads agency gains from a partner CSS, how to activate it for dozens of Merchant Center accounts, how billing works and what to ask a CSS when you speak for many clients. Including the difference between self-service CSS, your own CSS and white label.
Google CSS partners in Romania: the full list and how to choose
Every CSS a store in Romania can use, as of October 2026: Romanian-run CSSs, European platforms and agencies with their own CSS, with each one's pricing model and the criteria to choose by. Google's official directory and how to read it.
CSS and Performance Max: where the discount applies and where it does not
The CSS saving applies to the Shopping component of Performance Max, to standard Shopping campaigns and to Demand Gen with a product feed. It does not apply to Search, Display, YouTube or free listings. Each case explained, and how to measure the effect properly.
How much does a Google CSS cost: pricing models, public prices and when it pays off
A partner CSS costs between nothing and a few hundred euros a month depending on the model: flat fee, percentage of ad spend or bundled in an agency fee. Public prices of the main CSSs in Europe (October 2026) and a simple calculation to see from which budget it is worth it.
How to switch to a partner CSS in Google Merchant Center, step by step
Switching to a CSS takes a few minutes and is done through an approval in Merchant Center. The exact steps, what you see in your account, how to check which CSS you use now, what to do with Google Shopping afterwards and how to go back if you want.
What is Google CSS and how does it lower your Google Shopping cost per click
A CSS (Comparison Shopping Service) is a price comparison service through which stores place their Google Shopping ads. Through a partner CSS, your whole bid enters the auction instead of about 80% of it. Here is where the difference comes from, what changes in your account and what it costs.